This document provides an introduction to writing expository essays for a week 1 writing course. It discusses the purpose of expository essays as conveying information to readers through facts and explanation without opinion. Various prewriting and brainstorming techniques are introduced to help students organize their thoughts before writing, including freewriting, listing, considering multiple perspectives on a topic, and questioning formats like who, what, when, where, why and how. Students are then prompted to practice brainstorming techniques through an interactive activity.